Metallic swing joint for pipes



y 1935- D. A. MURPHY METALLIC SWING JOINT FOR PIPES Filed June 13, 1955Patented May 7, 1935 UNI-TED STATES PATENT OFFICE METALLIC SWING JOINTFOR PIPES ware Application June 13, 1933, Serial No. 675,576

1 Claim.

This invention relates to metallic swing joints employed for connectingsections of tubular pipe in a fluid tight relation and permitting freeoscillation at the joint when the pipe is convey- 5 ing fluid under highpressures. The invention is directed to an improvement over the metallicswing joint which is the subject of Patent No. 1,920,658, issued August1, 1933, to applicant and Arthur J. Hodge.

One object of this invention is to provide a swing joint having a pairof symmetrical T- shaped trunnion members with connecting members havingcurved fluid passages to minimize the turbulence and resistance to flowthrough the joint.

Another object of this invention is to provide a swing joint having apressure packed type of seal that is conveniently and readilyreplaceable.

A further object of this invention is to provide a novel means to securethe connecting members in their respective positions on the T-shapedtrunnion members. Other objects of the invention will appear from thefollowing description.

Figure 1 is a front elevation of the swing joint, being partly incross-section.

Figure 2 is a side elevation of the swing joint.

Referring to the drawing, I and 2 indicate two similar T-shaped membershaving threaded openings 3 for connection with a section of pipe (notshown), said threaded openings communicating with divergent symmetricalpassages which terminate on the outer lateral faces 5 of the trunnionportions 6.

Fitting over the trunnion portions 6 and connecting the T-shaped membersI and 2 are two connecting members I and 8, each having a continuousstream line passage 9 communicating with and connecting the passages 4in the members I and 2. Sockets ID in the members I and 8 provide asubstantial bearing for the trunnions 6, the said bearing beinglubricated through some suitable pressure connection as indicated at II.

Connecting the ends of each of the members I and 8 is a bridge portionI2 having a lateral opening I3 for a double end bolt I 4 which securesthe members I and 8 on the trunnions 6. The bolt I4 is provided withthreaded nuts I5 which fit within the openings I6 formed between thebridge portion I2 and the curved passage portion of the members I and 8.With the construction thus described, it is possible to make asubstantial form of swing joint of the type described which is securelyheld in assembled re- 5 lation in a manner that does not affect the freeflow of fluid through the joint.

In the bottom face of the socket recess I0 there is provided an annulargroove I I for receiving a pressure packed packing ring I8. The 10packing ring I8 is preferable of the form shown, having lipped edges I9which seal against the face 5 of the trunnion 6 and the bottom of therecess l1. Passages 20 convey the pressure of the fluid in the passage 9to the groove IT to 15 expand the packing I8.

Lugs 2| having openings 22 are formed on the members I and 2 to providemeans for connecting a series of swing joints by a wire cable. (notshown) for the purpose of preventing any 20 injury to the operators thatwould otherwise possibly be inflicted if one of the swing joints shouldfail or become disconnected from its con nection.

I claim:-

In a metallic swing joint connection, the combination of a pair ofsimilar swivel members, each having a swivel head at one end formed withoutwardly projecting and axially aligned trunnions and having a fluidpassage extending therethrough and terminating in a pair of divergingbranches opening laterally outward through the faces of the trunnions, apair of connecting members having bearing sockets fitting over thetrunnions and being provided with passages communicating with andconnecting the fluid passages in the swivel members, packing meansprovided between the parallel trunnion faces and the complementarymating face of each bearing socket, said packing means includingapacking ring positioned in an annular radially confined groove in oneof said faces, said packing ring having radially inward extending lipportions engaging the faces of the trunnion and the bearing socketrespectively, means to 5 convey fluid to said groove to expand thepacking against said faces and adjustable means securing the connectingmembers in position on the swivel members.

DEMERY A. MURPHY.

